[mapserver-users] Re: Transparency via WMS request?

[Roger André]

Sorry, but I can't test that.  I don't have pdf support compiled into this
version of Mapserver.

I did get transparency to work using the AGG driver by altering my
OUTPUTFORMAT to look like this:
  OUTPUTFORMAT
   NAME 'AGGA'
   DRIVER AGG/PNG
   IMAGEMODE RGBA
   EXTENSION "png"
   FORMATOPTION "TRANSPARENT=ON"
   FORMATOPTION "INTERLACE=OFF"
   TRANSPARENT ON
  END #end outputformat

Unfortunately, it seemed to have decreased the quality of the rendering.
I've switched back to using the GD driver, and that seems to give good
quality and correct transparency.
  OUTPUTFORMAT
   NAME 'png'
   DRIVER GD/PNG
   IMAGEMODE RGBA
   EXTENSION "png"
   FORMATOPTION "TRANSPARENT=ON"
   FORMATOPTION "INTERLACE=OFF"
   TRANSPARENT ON
  END #end outputformat

---

On Wed, Sep 24, 2008 at 3:39 PM, Robert Sanson <SansonR at asurequality.com>wrote:

>  Is it possible to get layer transparency when outputformat=PDF?
>
> Thanks,
>
> Robert Sanson
>
> >>> "Roger André" <randre at gmail.com> 25/09/2008 10:36 a.m. >>>
> Thanks to some help from a fellow GIS developer, I think I've narrowed the
> problem down to the OUTPUTFORMAT section of my mapfile.  Changing from the
> AGG to GD driver seemed to take care of the problem.  Will need to do some
> additional futzing to see if I can get it working with AGG.
> --
>
>
>
> On Wed, Sep 24, 2008 at 1:38 PM, Roger André <randre at gmail.com> wrote:
>
>> Ok, this is driving me bonkers.  I have a raster image with nodata values
>> set to be transparent.  When I make requests to this layer in "mode=map", it
>> works beautifully, and the nodata values are transparent.
>>
>> -
>> http://localhost/cgi-bin/mapserv?map=/var/www/mapfiles/temp/temp.map&mode=map
>>
>> However, when I try to view the same data via a WMS request, the nodata
>> values are displayed in black.
>>
>> - http://localhost/cgi-bin/mapserv?map=/var/www/mapfiles/temp/temp.map
>> &SERVICE=WMS
>> &version="1.1.122
>>
>> &REQUEST=GetMap
>> &LAYERS=imagery
>> &STYLES=
>> &BBOX=-180,-90,180,90
>> &WIDTH=600
>> &HEIGHT=500
>> &FORMAT=png
>> &SRS=epsg:4326
>>
>> I have tried doing a couple of things to fix this, none of which has
>> worked:
>> - added "wms_transparent"     "TRUE" to METADATA section of LAYER
>> - added "&TRANSPARENT=TRUE" to the end of the WMS request
>> - made sure that in OUTPUTFORMAT I have all of these:
>>   OUTPUTFORMAT
>>    NAME png
>>    DRIVER "AGG/PNG"
>>    MIMETYPE "image/png"
>>    IMAGEMODE RGBA
>>    EXTENSION "png"
>>    FORMATOPTION "TRANSPARENT=ON"
>>    FORMATOPTION "INTERLACE=OFF"
>>    TRANSPARENT ON
>>   END #end outputformat
>>
>> Please, can anyone tell me what I'm missing?
>>
>> Thanks,
>>
>> Roger
>> --
>>
>
>
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